docs: def build(self, corpus, method, slice_kwargs={}, method_kwargs={}):
          """
          Generate a set of :ref:`networkx.Graph <networkx:graph>`\s using
          ``method`` on the slices in ``corpus``\.
  
          Parameters
          ----------
          corpus : :class:`.Corpus`
          method : str or func
              If str, looks for ``method`` in the ``tethne`` namespace.
          slice_kwargs : dict
              Keyword arguments to pass to ``corpus``' ``slice`` method.
          method_kwargs : dict
              Keyword arguments to pass to ``method`` along with ``corpus``.
          """
          if not hasattr(method, '__call__'):
              if not hasattr(networks, method):
                  raise NameError('No such method')
              method = getattr(networks, method)
          for key, subcorpus in corpus.slice(**slice_kwargs):
              graph = method(subcorpus, **method_kwargs)
              self.add(key, graph)